It probably has something to do with the mesh because generally, resizing the handle won’t change the size of an ordinary mesh parented to a standard part, SpecialMeshs on the other hand have the ability to change their size like a normal part, so instead of that you could potentially just have a SpecialMesh with the asset id of the Mesh inside the part, tweak it a little and start animating from that point on.
Sorry I don’t think you can scale the tool handle in moon animator 2 or maybe you can you just need to make it a moon file but I used the Scale API + Animation Events.